Microstructure, surface characterization and long-term stability of new quaternary Ti-Zr-Ta-Ag alloy for implant use. - Vasilescu, C.; Osiceanu, P.; Moreno, J.M. Calderon; Drob, S.I.; Preda, S.; Popa, M.; Dan, I.; Marcu, M.; Prodana, M.; Popovici, I.A.; Ionita, D.; Vasilescu, E. (Materials Science & Engineering: C, 2017)